New 9" slimline direct fit power brake booster, master cylinder & Brake Pedal for Automatic Transmission Vehicles. This top quality power brake booster is designed mount directly to your factory firewall. This power booster works great as a factory replacement or as an upgrade from manual to power brakes for vehicles with automatic transmissions. Also included in this kits is a new factory style 1" bore master cylinder. Note: If switching from manual to power brakes a power brake pedal is required.